报告题目：Double diffusive convection

报告人： Prof. Detlef Lohse

报告人单位： University of Twente

报告时间：Oct.11 (Thursday) 3:00pm-5:00pm

报告地点：B-518, Lee Shau Kee Building of Science and Technology

邀请人： Prof. Chao Sun

Abstract:

In the talk, we will discuss double diffusive convection. First, we will focus on the fingering regime, which is the relevant regime for double diffusion in the tropical ocean, with a destabilizing salt concentration field and a stabilizing temperature field. We will focus on the flow structure and on scaling laws of the transport quantities, the Reynolds number, and boundary layer and finger thicknesses. We will show that the unifying scaling theory developed for Rayleigh-Benard convection can predict the salinity flux and the Reynolds number in some regimes of double diffusive convection, too, without introducing any new parameters. Next, I will show how staircases form in this regime. Finally, we will discuss the scaling law in the two-scalar regime when both temperature gradient and salinity gradient drive the flow. This is joint work with Yantao Yang (PKU, Bejing) and Roberto Verzicco (Twente and Rome).

Bio:

Detlef Lohse got his PhD on the theory of turbulence in Marburg/Germany in 1992. As a postdoc in Chicago and later in Marburg and Muenchen he worked on single bubble sonoluminescence. In 1998, he got appointed as Chair of Physics of Fluids at the University of Twente, The Netherlands, where he still is. Lohse's present research subjects are turbulence and multiphase flow, biomedical flow, granular matter, and micro- and nanofluidics. Lohse is Associate Editor of Journal of Fluid Mechanics, Annual Review of Fluid Mechanics, and several other journals. He is Fellow of the American Physical Society, Division of Fluid Dynamics, and of IoP. He is a member of the German Academy of Sciences, a member of the Royal Dutch Academy of Sciences, and a member of the National Academy of Engineering (NAE) of the United States of America. He received various prizes such as the Spinoza Prize (2005), the Simon Stevin Prize (2009), two ERC-Advanced Grants (2011,2017), the Physica Prize (2011), the George K. Batchelor Prize for Fluid Dynamics (2012), the AkzoNobel Prize (2012), the American Physical Society Fluid Dynamics Prize (2017), and the Balzan Prize (2018). He also set up the first (and up to now only) Dutch Max-Planck Center (2016, on Complex Fluid Dynamics).